TCAR POST-TEST REAL EXAM COMPLETE QUESTIONS
AND 100% CORRECT ANSWERS
1. Helmets and automobile airbags work because they
A. prevent blows to the head.
B. reduce acceleration injuries.
C. increase deceleration speed.
D. add deceleration distance.
Correct Answer: B - reduce acceleration injuries.
Explanation: Helmets and airbags work by reducing acceleration injuries. They
increase the time over which deceleration occurs, thereby reducing the force
applied to the body. They do not simply prevent blows to the head (A) or add
deceleration distance (D) as their primary mechanism, and they certainly do not
increase deceleration speed (C) which would be harmful.
2. Which of the following statements best describes knife wounds? Their
velocity is _____, the temporary cavity _____, and damage _____.
A. low; depends on the size of the knife; is usually extensive
B. low; is insignificant; is limited to structures directly in object's path
C. high; will be small; affects structures at some distance from the wound tract
D. high; may be massive; results in widespread tissue destruction
Correct Answer: B - low; is insignificant; is limited to structures directly in
object's path
Explanation: Knife wounds are low-velocity injuries. Unlike high-velocity
projectiles, they do not create significant temporary cavitation. The damage is
,primarily limited to structures that are directly in the path of the knife blade. There
is minimal tissue disruption beyond the immediate wound tract.
3. Injury to which body structure is commonly a DELAYED finding in the blast
trauma patient?
A. Heart
B. Bladder
C. Bowel
D. Spleen
Correct Answer: C - Bowel
Explanation: Bowel injury is a classic delayed finding in blast trauma patients. The
bowel, particularly the small intestine and colon, can develop perforations or
ischemia that may not be immediately apparent. The delay occurs because the
blast wave can cause microvascular injury and ischemia that progresses over
hours to days. Heart (A), bladder (B), and spleen (D) injuries typically present more
acutely.
4. Shock occurs when
A. the sodium-potassium pump fails.
B. ATP levels are less than lactic acid levels.
C. cellular oxygen demand is greater than supply.
D. aerobic metabolism exceeds anaerobic metabolism.
Correct Answer: C - cellular oxygen demand is greater than supply.
Explanation: Shock fundamentally represents an imbalance between oxygen
delivery and oxygen demand at the cellular level. When cellular oxygen demand
exceeds supply, cells switch to anaerobic metabolism, leading to lactic acidosis and
cellular dysfunction. While the sodium-potassium pump (A) may eventually fail,
this is a consequence rather than the definition. ATP levels and lactic acid levels (B)
,are not directly compared in this manner, and aerobic metabolism exceeding
anaerobic (D) would be a normal state, not shock.
5. _____ shock is the most common type of shock immediately after traumatic
injury.
A. Distributive
B. Septic
C. Cardiogenic
D. Hypovolemic
Correct Answer: D - Hypovolemic
Explanation: Hypovolemic shock is the most common type of shock immediately
following traumatic injury. This results from blood loss (hemorrhage) or fluid loss
from injuries. While distributive (A), septic (B), and cardiogenic (C) shock can occur
in trauma patients, they typically develop later or are less common in the
immediate post-injury period.
6. Which findings suggest a trauma patient is experiencing cardiogenic shock?
A. Bradycardia, cyanosis, and elevated mean arterial pressure
B. High shock index, mottling, and hypotension
C. Tachycardia, flushing, and widened pulse pressure
D. Pallor, course breath sounds, and hypertension
Correct Answer: B - High shock index, mottling, and hypotension
Explanation: Cardiogenic shock in trauma patients presents with a high shock
index (heart rate/systolic blood pressure > 0.9), mottling of the skin due to poor
perfusion, and hypotension. Bradycardia (A) would be unusual in shock states.
Tachycardia with flushing and widened pulse pressure (C) suggests distributive
shock. Pallor with hypertension (D) does not fit the cardiogenic shock pattern.
, 7. A multisystem trauma patient has become progressively tachycardic and
hypotensive one week after hospital admission. Pulse pressure is wide. The
most likely explanation for this finding is
A. dehydration.
B. fat embolism syndrome.
C. surgical site bleeding.
D. sepsis.
Correct Answer: D - sepsis.
Explanation: The development of tachycardia, hypotension, and a widened pulse
pressure one week after admission is most consistent with sepsis. This is the classic
presentation of systemic inflammatory response syndrome (SIRS) progressing to
sepsis in a hospitalized trauma patient. Dehydration (A) could cause these
symptoms but is less likely to cause a wide pulse pressure. Fat embolism syndrome
(B) typically presents earlier (24-72 hours) with respiratory and neurological
symptoms. Surgical site bleeding (C) would present more acutely with signs of
acute hemorrhage.
8. Normalizing a trauma patient's body temperature helps control bleeding
because hypothermia
A. produces shivering and makes platelets hyperactive.
B. causes platelet dysfunction and clotting system failure.
C. stimulates the clotting cascade and reduces blood pressure.
D. increases tissue oxygen consumption and cold diuresis.
Correct Answer: B - causes platelet dysfunction and clotting system failure.
Explanation: Hypothermia causes platelet dysfunction and impairs the clotting
cascade, leading to coagulopathy and worsened bleeding. When a trauma patient
becomes hypothermic, platelet function is significantly impaired, and coagulation
factor activity is reduced. Shivering (A) would increase metabolic demand.
Stimulating the clotting cascade (C) is not what happens—hypothermia impairs it.
AND 100% CORRECT ANSWERS
1. Helmets and automobile airbags work because they
A. prevent blows to the head.
B. reduce acceleration injuries.
C. increase deceleration speed.
D. add deceleration distance.
Correct Answer: B - reduce acceleration injuries.
Explanation: Helmets and airbags work by reducing acceleration injuries. They
increase the time over which deceleration occurs, thereby reducing the force
applied to the body. They do not simply prevent blows to the head (A) or add
deceleration distance (D) as their primary mechanism, and they certainly do not
increase deceleration speed (C) which would be harmful.
2. Which of the following statements best describes knife wounds? Their
velocity is _____, the temporary cavity _____, and damage _____.
A. low; depends on the size of the knife; is usually extensive
B. low; is insignificant; is limited to structures directly in object's path
C. high; will be small; affects structures at some distance from the wound tract
D. high; may be massive; results in widespread tissue destruction
Correct Answer: B - low; is insignificant; is limited to structures directly in
object's path
Explanation: Knife wounds are low-velocity injuries. Unlike high-velocity
projectiles, they do not create significant temporary cavitation. The damage is
,primarily limited to structures that are directly in the path of the knife blade. There
is minimal tissue disruption beyond the immediate wound tract.
3. Injury to which body structure is commonly a DELAYED finding in the blast
trauma patient?
A. Heart
B. Bladder
C. Bowel
D. Spleen
Correct Answer: C - Bowel
Explanation: Bowel injury is a classic delayed finding in blast trauma patients. The
bowel, particularly the small intestine and colon, can develop perforations or
ischemia that may not be immediately apparent. The delay occurs because the
blast wave can cause microvascular injury and ischemia that progresses over
hours to days. Heart (A), bladder (B), and spleen (D) injuries typically present more
acutely.
4. Shock occurs when
A. the sodium-potassium pump fails.
B. ATP levels are less than lactic acid levels.
C. cellular oxygen demand is greater than supply.
D. aerobic metabolism exceeds anaerobic metabolism.
Correct Answer: C - cellular oxygen demand is greater than supply.
Explanation: Shock fundamentally represents an imbalance between oxygen
delivery and oxygen demand at the cellular level. When cellular oxygen demand
exceeds supply, cells switch to anaerobic metabolism, leading to lactic acidosis and
cellular dysfunction. While the sodium-potassium pump (A) may eventually fail,
this is a consequence rather than the definition. ATP levels and lactic acid levels (B)
,are not directly compared in this manner, and aerobic metabolism exceeding
anaerobic (D) would be a normal state, not shock.
5. _____ shock is the most common type of shock immediately after traumatic
injury.
A. Distributive
B. Septic
C. Cardiogenic
D. Hypovolemic
Correct Answer: D - Hypovolemic
Explanation: Hypovolemic shock is the most common type of shock immediately
following traumatic injury. This results from blood loss (hemorrhage) or fluid loss
from injuries. While distributive (A), septic (B), and cardiogenic (C) shock can occur
in trauma patients, they typically develop later or are less common in the
immediate post-injury period.
6. Which findings suggest a trauma patient is experiencing cardiogenic shock?
A. Bradycardia, cyanosis, and elevated mean arterial pressure
B. High shock index, mottling, and hypotension
C. Tachycardia, flushing, and widened pulse pressure
D. Pallor, course breath sounds, and hypertension
Correct Answer: B - High shock index, mottling, and hypotension
Explanation: Cardiogenic shock in trauma patients presents with a high shock
index (heart rate/systolic blood pressure > 0.9), mottling of the skin due to poor
perfusion, and hypotension. Bradycardia (A) would be unusual in shock states.
Tachycardia with flushing and widened pulse pressure (C) suggests distributive
shock. Pallor with hypertension (D) does not fit the cardiogenic shock pattern.
, 7. A multisystem trauma patient has become progressively tachycardic and
hypotensive one week after hospital admission. Pulse pressure is wide. The
most likely explanation for this finding is
A. dehydration.
B. fat embolism syndrome.
C. surgical site bleeding.
D. sepsis.
Correct Answer: D - sepsis.
Explanation: The development of tachycardia, hypotension, and a widened pulse
pressure one week after admission is most consistent with sepsis. This is the classic
presentation of systemic inflammatory response syndrome (SIRS) progressing to
sepsis in a hospitalized trauma patient. Dehydration (A) could cause these
symptoms but is less likely to cause a wide pulse pressure. Fat embolism syndrome
(B) typically presents earlier (24-72 hours) with respiratory and neurological
symptoms. Surgical site bleeding (C) would present more acutely with signs of
acute hemorrhage.
8. Normalizing a trauma patient's body temperature helps control bleeding
because hypothermia
A. produces shivering and makes platelets hyperactive.
B. causes platelet dysfunction and clotting system failure.
C. stimulates the clotting cascade and reduces blood pressure.
D. increases tissue oxygen consumption and cold diuresis.
Correct Answer: B - causes platelet dysfunction and clotting system failure.
Explanation: Hypothermia causes platelet dysfunction and impairs the clotting
cascade, leading to coagulopathy and worsened bleeding. When a trauma patient
becomes hypothermic, platelet function is significantly impaired, and coagulation
factor activity is reduced. Shivering (A) would increase metabolic demand.
Stimulating the clotting cascade (C) is not what happens—hypothermia impairs it.
